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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <script>
        var obj = {
        name: "gkd"
        };
        function foo() {
        console.log("foo函数:", this);
        }
        foo.call(obj); // 使⽤显式绑定this为obj
        foo.call(123); // 将this显式绑定为⼀个数字
        foo.call("abc"); // 将this显式绑定为⼀个字符串
    </script>
</body>
</html>